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Note on Electric Power Consumption

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The total electric energy consumed by an individual (especially houses) measured in kilowatt-hour is called electric power consumption. All the power companies install a meter in their customer's house so that they can charge according to the electric consumption. Those installed meters measure electricity on kilowatt-hour (KWH). In normal terms, we say 1 unit for 1 KWH. It is actually the amount of power used for a certain period of time. For the easy purpose, we say an electrical appliance of 1000W consuming power for one hour will consume 1KWH i.e. 1KWH = 1KW x 1hr.

Power Consumption = Power consumed by appliance x no of appliance x time operating

= P (in KW) x N x T (in hour)

Amount to pay = power consumption x price per unit

So, to calculate total power consumption of a home, we need to know the power of each equipment, number of equipment and time they run. Since all the appliances are not run at the same time and same period of time it is better to calculate power consumed by each appliance and add all at last.

Example:

If a home has 10 tube lights of 30W that run for 4 hours daily, 5 television of 200W running for 3 hours daily, 2 irons 1000W 1 hour weekly. Calculate total amount to be paid if the cost per unit is Rs. 7.

The power of an electric machine is the rate of doing work per unit time. Actually, the rate of converting energy in unit time is called electric power. The electric power is measured in watt.
1 watt = 1 joule/ second
Electrical power is calculated as follows: -
Power (P) = potential difference (V) × current (I)
P = V × I